1 ; Test optimization remarks generated by the LoopInterchange pass.
3 ; RUN: opt < %s -basic-aa -loop-interchange -verify-dom-info -verify-loop-info \
4 ; RUN: -pass-remarks-output=%t -pass-remarks-missed='loop-interchange' \
5 ; RUN: -pass-remarks='loop-interchange' -S
6 ; RUN: cat %t | FileCheck %s
8 ; RUN: opt < %s -basic-aa -loop-interchange -verify-dom-info -verify-loop-info \
9 ; RUN: -pass-remarks-output=%t -pass-remarks-missed='loop-interchange' \
10 ; RUN: -pass-remarks='loop-interchange' -S -da-disable-delinearization-checks
11 ; RUN: cat %t | FileCheck --check-prefix=DELIN %s
13 @A = common global [100 x [100 x i32]] zeroinitializer
14 @B = common global [100 x [100 x i32]] zeroinitializer
15 @C = common global [100 x i32] zeroinitializer
17 ;;---------------------------------------Test case 01---------------------------------
18 ;; Loops interchange is not profitable.
19 ;; for(int i=1;i<N;i++)
20 ;; for(int j=1;j<N;j++)
21 ;; A[i-1][j-1] = A[i - 1][j-1] + B[i][j];
23 define void @test01(i32 %N){
25 %cmp31 = icmp sgt i32 %N, 1
26 br i1 %cmp31, label %for.cond1.preheader.lr.ph, label %for.end19
28 for.cond1.preheader.lr.ph:
30 br label %for.body3.lr.ph
33 %indvars.iv34 = phi i64 [ 1, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next35, %for.inc17 ]
34 %1 = add nsw i64 %indvars.iv34, -1
38 %indvars.iv = phi i64 [ 1, %for.body3.lr.ph ], [ %indvars.iv.next, %for.body3 ]
39 %2 = add nsw i64 %indvars.iv, -1
40 %arrayidx6 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %1, i64 %2
41 %3 = load i32, i32* %arrayidx6
42 %arrayidx10 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @B, i64 0, i64 %indvars.iv34, i64 %indvars.iv
43 %4 = load i32, i32* %arrayidx10
44 %add = add nsw i32 %4, %3
45 store i32 %add, i32* %arrayidx6
46 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
47 %lftr.wideiv = trunc i64 %indvars.iv to i32
48 %exitcond = icmp eq i32 %lftr.wideiv, %0
49 br i1 %exitcond, label %for.inc17, label %for.body3
52 %indvars.iv.next35 = add nuw nsw i64 %indvars.iv34, 1
53 %lftr.wideiv37 = trunc i64 %indvars.iv34 to i32
54 %exitcond38 = icmp eq i32 %lftr.wideiv37, %0
55 br i1 %exitcond38, label %for.end19, label %for.body3.lr.ph
62 ; CHECK-NEXT: Pass: loop-interchange
63 ; CHECK-NEXT: Name: Dependence
64 ; CHECK-NEXT: Function: test01
66 ; CHECK-NEXT: - String: Cannot interchange loops due to dependences.
70 ; DELIN-NEXT: Pass: loop-interchange
71 ; DELIN-NEXT: Name: InterchangeNotProfitable
72 ; DELIN-NEXT: Function: test01
74 ; DELIN-NEXT: - String: 'Interchanging loops is too costly (cost='
75 ; DELIN-NEXT: - Cost: '2'
76 ; DELIN-NEXT: - String: ', threshold='
77 ; DELIN-NEXT: - Threshold: '0'
78 ; DELIN-NEXT: - String: ') and it does not improve parallelism.'
81 ;;--------------------------------------Test case 02------------------------------------
82 ;; [FIXME] This loop though valid is currently not interchanged due to the
83 ;; limitation that we cannot split the inner loop latch due to multiple use of inner induction
84 ;; variable.(used to increment the loop counter and to access A[j+1][i+1]
85 ;; for(int i=0;i<N-1;i++)
86 ;; for(int j=1;j<N-1;j++)
87 ;; A[j+1][i+1] = A[j+1][i+1] + k;
89 define void @test02(i32 %k, i32 %N) {
91 %sub = add nsw i32 %N, -1
92 %cmp26 = icmp sgt i32 %N, 1
93 br i1 %cmp26, label %for.cond1.preheader.lr.ph, label %for.end17
95 for.cond1.preheader.lr.ph:
96 %cmp324 = icmp sgt i32 %sub, 1
98 %1 = sext i32 %sub to i64
99 br label %for.cond1.preheader
102 %cmp = icmp slt i64 %indvars.iv.next29, %1
103 br i1 %cmp, label %for.cond1.preheader, label %for.end17
106 %indvars.iv28 = phi i64 [ 0, %for.cond1.preheader.lr.ph ], [ %indvars.iv.next29, %for.cond.loopexit ]
107 %indvars.iv.next29 = add nuw nsw i64 %indvars.iv28, 1
108 br i1 %cmp324, label %for.body4, label %for.cond.loopexit
111 %indvars.iv = phi i64 [ %indvars.iv.next, %for.body4 ], [ 1, %for.cond1.preheader ]
112 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
113 %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv.next, i64 %indvars.iv.next29
114 %2 = load i32, i32* %arrayidx7
115 %add8 = add nsw i32 %2, %k
116 store i32 %add8, i32* %arrayidx7
117 %lftr.wideiv = trunc i64 %indvars.iv to i32
118 %exitcond = icmp eq i32 %lftr.wideiv, %0
119 br i1 %exitcond, label %for.cond.loopexit, label %for.body4
126 ; CHECK-NEXT: Pass: loop-interchange
127 ; CHECK-NEXT: Name: Dependence
128 ; CHECK-NEXT: Function: test02
130 ; CHECK-NEXT: - String: Cannot interchange loops due to dependences.
134 ; DELIN-NEXT: Pass: loop-interchange
135 ; DELIN-NEXT: Name: UnsupportedInsBetweenInduction
136 ; DELIN-NEXT: Function: test02
138 ; DELIN-NEXT: - String: Found unsupported instruction between induction variable increment and branch.
141 ;;-----------------------------------Test case 03-------------------------------
142 ;; Test to make sure we can handle output dependencies.
144 ;; for (int i = 0; i < 2; ++i)
145 ;; for(int j = 0; j < 3; ++j) {
150 @A10 = local_unnamed_addr global [3 x [3 x i32]] zeroinitializer, align 16
152 define void @test03() {
154 br label %for.cond1.preheader
156 for.cond.loopexit: ; preds = %for.body4
157 %exitcond28 = icmp ne i64 %indvars.iv.next27, 2
158 br i1 %exitcond28, label %for.cond1.preheader, label %for.cond.cleanup
160 for.cond1.preheader: ; preds = %for.cond.loopexit, %entry
161 %indvars.iv26 = phi i64 [ 0, %entry ], [ %indvars.iv.next27, %for.cond.loopexit ]
162 %indvars.iv.next27 = add nuw nsw i64 %indvars.iv26, 1
165 for.cond.cleanup: ; preds = %for.cond.loopexit
168 for.body4: ; preds = %for.body4, %for.cond1.preheader
169 %indvars.iv = phi i64 [ 0, %for.cond1.preheader ], [ %indvars.iv.next, %for.body4 ]
170 %arrayidx6 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv26
171 %tmp = trunc i64 %indvars.iv26 to i32
172 store i32 %tmp, i32* %arrayidx6, align 4
173 %arrayidx10 = getelementptr inbounds [3 x [3 x i32]], [3 x [3 x i32]]* @A10, i64 0, i64 %indvars.iv, i64 %indvars.iv.next27
174 %tmp1 = trunc i64 %indvars.iv to i32
175 store i32 %tmp1, i32* %arrayidx10, align 4
176 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
177 %exitcond = icmp ne i64 %indvars.iv.next, 3
178 br i1 %exitcond, label %for.body4, label %for.cond.loopexit
182 ; CHECK-NEXT: Pass: loop-interchange
183 ; CHECK-NEXT: Name: Interchanged
184 ; CHECK-NEXT: Function: test03
186 ; CHECK-NEXT: - String: Loop interchanged with enclosing loop.
190 ; DELIN-NEXT: Pass: loop-interchange
191 ; DELIN-NEXT: Name: Interchanged
192 ; DELIN-NEXT: Function: test03
194 ; DELIN-NEXT: - String: Loop interchanged with enclosing loop.
197 ;;--------------------------------------Test case 04-------------------------------------
198 ;; Loops not tightly nested are not interchanged
199 ;; for(int j=0;j<N;j++) {
201 ;; for(int i=0;i<N;i++)
202 ;; A[j][i] = A[j][i]+B[j];
205 define void @test04(i32 %k, i32 %N){
207 %cmp30 = icmp sgt i32 %N, 0
208 br i1 %cmp30, label %for.body.lr.ph, label %for.end17
212 %1 = zext i32 %k to i64
216 %indvars.iv32 = phi i64 [ 0, %for.body.lr.ph ], [ %indvars.iv.next33, %for.inc15 ]
217 %2 = add nsw i64 %indvars.iv32, %1
218 %arrayidx = getelementptr inbounds [100 x i32], [100 x i32]* @C, i64 0, i64 %indvars.iv32
219 %3 = trunc i64 %2 to i32
220 store i32 %3, i32* %arrayidx
224 %indvars.iv = phi i64 [ 0, %for.body ], [ %indvars.iv.next, %for.body3 ]
225 %arrayidx7 = getelementptr inbounds [100 x [100 x i32]], [100 x [100 x i32]]* @A, i64 0, i64 %indvars.iv32, i64 %indvars.iv
226 %4 = load i32, i32* %arrayidx7
227 %add10 = add nsw i32 %3, %4
228 store i32 %add10, i32* %arrayidx7
229 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
230 %lftr.wideiv = trunc i64 %indvars.iv to i32
231 %exitcond = icmp eq i32 %lftr.wideiv, %0
232 br i1 %exitcond, label %for.inc15, label %for.body3
235 %indvars.iv.next33 = add nuw nsw i64 %indvars.iv32, 1
236 %lftr.wideiv35 = trunc i64 %indvars.iv32 to i32
237 %exitcond36 = icmp eq i32 %lftr.wideiv35, %0
238 br i1 %exitcond36, label %for.end17, label %for.body
245 ; CHECK-NEXT: Pass: loop-interchange
246 ; CHECK-NEXT: Name: Dependence
247 ; CHECK-NEXT: Function: test04
249 ; CHECK-NEXT: - String: Cannot interchange loops due to dependences.
253 ; DELIN-NEXT: Pass: loop-interchange
254 ; DELIN-NEXT: Name: NotTightlyNested
255 ; DELIN-NEXT: Function: test04
257 ; DELIN-NEXT: - String: Cannot interchange loops because they are not tightly nested.